Two-phase high damping capacity F3-Mn-Al-C based alloy

Details Two-phase high damping capacity F3-Mn-Al-C based alloy Two-phase high damping capacity F3-Mn-Al-C based alloy

1989-04-20

1990-10-30

Yee, Deborah

Metal treatment

Stock

Ferrous

420 74, 420 56, C22C 3804, C22C 3806

Patent

active

049666363

ABSTRACT:
Carbon steels and other hot-and cold-workable ferrous alloys generally have poor damping capacity as compared to that cast iron (gray cast iron, malleable cast iron and ductile cast iron). This is because the graphite in cast irons helps to absorb the damping force and depresses the damping wave. But cast iron can not be rolled into strip or sheet.
By controlling the correlated concentrations of manganese, aluminum and carbon, Fe-Mn-Al-C based alloys are made to be .alpha.+.gamma. two-phase alloy steel with different .alpha. and .gamma. volume fractions. With particular ferrite volumes, workable Fe-Mn-Al-C based alloys have equivalent and better damping capacity than that of cast irons especially in the high frequency side. Such alloys suppress the vibration noise that comes from machine rooms, motors, air conditioners, and etc. Chromium and other minor amount of elements can be added to this alloy system to improve the corrosion resistance.

REFERENCES:
patent: 4398951 (1983-08-01), Wallwork
patent: 4847046 (1989-07-01), Kim et al.
patent: 4865662 (1989-09-01), Zimmer et al.

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